Yes, you should read the manuals and try it out, given how easy and cheap it is to play around with smaller-instance cloud servers.

I also started writing a tutorial series for practitioners you can check out:

https://github.com/nh2/nixops-tutorial

I've only written 2 tutorials in there so far doing basic things. In the future and as time permits, I'd like to write about how my org implemented various tasks with NixOps, such as rolling deployments, highly available database setups with automatic fallbacks, distributed file systems, how you can patch any software in your stack, how to write reliable systemd services with correct dependencies, and so on.